Four-wheeled carry scraper



I B. D.- LAMY FOUR-WHEELED CARRY SCRAPER March 13, 1951 3 Sheets-Sheet 1 Filed Dec. 21, 1945 Jnve 72107 5.1.. a. LAMY March 13, 1951 B. D. LAMY 2,545,235

FOUR-WHEELED CARRY SCRAPER Filed Dec. 21, 1945 3 Sheets-Sheet 2 Invent r 3.1..0. L/wri "4 K March 13, 1951 B. D. LAMY 2,545,235

FOUR-WHEELED CARRY SCRAPER F iled Dec. 21, 1945 3 Sheets-Sheet 5 Inuenlor Patented Mar. 13, 1951 UNITED STATES 2,545,235 FOUR-WHEELED CARRY SCRAPER Bernard Lucien Dsir Lamy, Chateauneuf dfIsere France Application December 21, 1945, Serial No. 636,371

In France December 29, 1944 6 Claims. (01. meme) This invention relates to earth moving devices and, more particularly, to an improved scraper for loading material, transporting it to a dump, and discharging the material.

Scrapers of this type comprise a scraper .pan mounted on a suitable carriage and mechanism for causing the pan to dig into the earth as the pan is pulled along by the scraper. When the pan is filled, it is moved from the digging position to the carrying position so that the carriage may transport the pan to the dump. Suitable mecha nism is provided to tilt the pan to the discharge position and open a door so as to discharge the contents of the pan.

In accordance with the present invention, a

novel supporting arrangement for the pan is provided so that the pan may be positioned in the digging, carrying, and discharge position by means of the combined action of a single pan actuating rope or cable and gravity. Additionally, a door is provided for the open end of the pan and so cooperatively arranged with the pan supporting arrangement as to be automatically opened in the digging and discharge positions of the pan while being held closed in the carrying position of the pan.

Further features of the invention will be apparent from the following description with reference to the accompanying drawings which show by way of example an embodiment of the invention, and in which: I

Fig. 1 is .a side elevational view showing a wheeled scraper according to the invention; Fig. la is an enlarged cross-section along line .ABinFig. 1.

Fig. 2 is a plan view corresponding to Fig.1;

Figs. 3, .4 and 5 are partial side elevation views showing a scraper pan door in diiferent' operative positions of the apparatus of Figs. 1 and 2.

Referring to the drawings, a tractor, for examplea Caterpillar tractor (not shown), is yoked with a towed wheeled carriage l comprising a frame mounted on field tired wheels 2, of which the forward dirigible set of wheels 3 may be detachable.

Carriage l includes parallel, longitudinal open side frames which are converged at their forward ends for support upon the axle of the dirigible forward wheels 3/ An axle extending between the forward ends of the side frames rotatably supports sheaves I and, beneath these sheaves, a sheave 6 is mounted on a bracket for swinging movement in a horizontal plane. A tie rod8 interconnects the side frames at the points Where they een o seev re 19 has were mine operation of the scraper pan and automatic door, as will be described.

From Fig. 1, it will be noted that theforward ends of the side frames are substantially higher than the rear ends, and each frame includes a top rail sloping from front to rear. Rails 5, for a purpose to be described, are preferably inwardly or downwardly facing channels. Beneath an intermediate section of top rail 5, each frame includes a frameelement d-forming a short runway or track inclined in the same direction as the top rail but at a considerably greater angle to the horizontal. Rearwardly tilted frame elements at each end of track 4 form roller stops therefor.

A scraper pan 9, having a forward open end closed by an automatically operable door is sup,- ported by the side frames through the medium of three pairs of rollers, all of these being mounted adjacent the upper edges of the pan side walls. The forward pair of rollers I0 is adapted .to roll on the inclined runways 4, and the rear pair I I is adapted to roll on the inclined top rails 5, while the pair 12, which is located forwardly of and beneath the pair I I, is adapted to roll on the underside of the runway 5 so as to prevent tipping of the rear end of the pan during digging. lopping the scraper pan 9 is an intermediate pair. of sheaves l3 mounted on an axle I 4 connecting two opposite lateral walls of the pan. Passing around the sheaves l3 and 1 is a single hoisting rope coming around the orientable sheaves 5 from a winch drum mounted on the tractor, whereby the sheaves I3 may be caused to move towards, or away from, the sheaves 6 and I. An abutment I6 mounted on the tow frame is adapted to meet the axle l 4 of sheaves 3. The scraper pan door consists of a ribbed iron sheet I! hinged at its upper edge, as at l8 to two side-bars l9 loosely pivoted at their rear ends, laterally of the pan, on the axle 20 carrying the pair of rollers it). Two side-ribs 2i of the door are extended upwardly to form stops 2; each adapted to abut against the corresponding sidebar 19 so as to prevent the door from swinging outwardly. Rotatably mounted on the inner surfaces of the side frames are rollers 23. (Figs, 1 and l) adapted to serve as sliding abutments for the slide-bars it under conditions described hereinafter. i

Thescraper pan may assume any one of three diiferent operative positions, including a substantially horizontal transport position, an in- Ql ned d ssin or scrapin positi n a d a ilte 3 discharge position. The scraper operates as follows:

When the scraper pan 9 is in its transportation position, i. e., in the substantially horizontal position, its rollers 10 are at the highest points of their travels on the runways 4, and its rollers I l and I2 are in the corresponding positions on, and beneath, the runways 5, respectively, while the stops 22 press against the side-bars l9, as shown in Figs. 1 and 3. In these conditions, the door cannot move outwardly; nor can it move inwardly when the pan is filled "with" material pressing against the door. When the pan is empty, its jolting during the transportation may make the door swing to a small extent inwardly.

For the digging or scraping operation, the

hoisting rope I5 is payed out. The scraper pan 9, due to its weight, then descends by gravity, with its rollers rolling on the runways 4 and 5, until the rollers ll) abut against the roller stops at lowermost endsof 'runway'sl, whereby'thecut ting edge carried bythe forward end'of the pan is caused to engage material to be handled, the pan having thus moved to'its inclined scraping position designated by 9 (Fig. l) and'its rollers to positions designatedby l, Hand [2, while its sheaves 13 have 'moved to a 'positiondesignatedby l3. During such movement of pan 9, the door moves from the position of Fig. 3 to that of Fig. 4. The outer ends of links ['9 move 'along lines parallel to runways 4, clearing'th'e cross member 8, until the links engage rollers 23. These rollers arrest downward movement of links H), during further rearward and downward movement of pan 9, so that the links swing clockwise relative tothe pan. The door is thus" swung away from the 'front of the pan, so" that its-lower edge is maintained at'a distance of atleast say 10 cm. from the ground, whatever may be the depthof the penetration'of'the forward er'id'o'f' the pan. This depth, which is'about 20 cm, may be adjusted by operating the ho' isting rope IS. The tractor'dragg'ing the scraper c'auses'the pan to be filled automatically. The rollers l l and I2, now'in the positions l and l2' respectively, cooperate to prevent exees'sive'pene'tration of the forward end of the pan into the material handled by arresting upwa'rd movement of the pan rear end. If in the course of operation an obstacle, such as a larger stone or a stub beencountered by tlie'lo'wer' edge of the pan door, the latter may swing inwardly about its" pivot on links 19, as in dicated by dot-and-dash lines in Fig. 4, and thereafter swing outwardly. When'the scraper pan is filled;'th'e tractor winch'is set in operation 'so as" to haul in the hoisting rope 15, whereby the pan iscadsed to rise on the runways 4 and 5 until is assumes the substantially horizontal transportation position shown in full lines in Fig. 1; 7

When the dumping point is reached, the winch is set again in operation to pull th hoisting rope I5 so as to cause'the sheaves 3, hence the loaded pan, to move towards the sheaves 1. However, the pan cannot accomplish such motion by-further following its runwaysgllfand 5, since the, rollers vIll are engaged witntheforward'roller tore 9 nw O it e. herha d; th

the sheaves l3 engages the abutment [6 provided on the tow frame; at this instant, the pan 9 assumes the dotted line position designated by 9" in Fig. l for its emptying operation, its sheaves l3 having passed over to the position [3, while the rollers H and I2 have been moved together with the pan over the positions II and [2", respectively. Meanwhile, the side-bars l9 (Fig. 5) have engaged the tie-rod 8 so as to immobilize the door with its lower edge held at a distance of about 20 cm. from the ground, and to open the intake-end of the pan thereby permitting the pan to empty automatically by gravity.

When the pan is discharged the hoisting rope I5 is payed out, whereupon the pan is caused by its weight to'swing backwards about the same axle*20; In the course of this backward motion the pan door closes and the pan finally returns to its transportation position, with its guiderollers II and I2 set again in their positions on the runwaysi' The invention scraper has numerous novel ad vantages 'both from the construction and the operation standpoints. Only a single cable or rope is required to operate the scraper pan and control its door, thus requiring only a single winch with a simple control. The operating cable, being above the scraper'pari, never engages the material handled and is thus subject only to traction and sheave friction stresses. No 'gearing is required for the scraper pan or door operation, such being effected solely through rollers operating on inclined runways, with the door operation being completely automatic. Additionally, the scraper is simple in construction, economical in operation, and capable of long'use with aminimum of maintenance, as the rollers are subject to very'little wear and only a minimum number of journals are required.

While a specific embodiment of the invention has been shown and described to illustrate the application of the invention principles, it should be understood that the inventionmay be otherwise embodied without departing from such principles. W

WhatIclaimis:

1. A scraper comprising, in combination, a wheeled carriage arranged to be towed by a trac tion vehicle and including a pair of laterally spaced side frames, each side frame including a rectilinear rail sloping rearwardly and. downwardly ata pre-set angle to the 'horizontal,,,a rectilinear runway disposed beneath saidv rail and sloping rearw'ardly and downwardlyat. an angle to the horizontal reater than suchpre-set angle, andelements at each end ofsaid runway forming front and rear stops for said runway; a scraper pan having a bottom, a pair of laterally spaced side walls, and a rear, wall, and disposed between said side frames; a firstpairpf rollers mountedon the upper forward parts of the pan side walls and rollin on said runways; a second pair of rollers mounted on the upper rearward parts of the pan side walls and rollingpnsaid rails; said pairs of rollers supporting said pan on said frames; means operatively connectedto the pan intermediate its ends and moved upwardly along said rails to such an extent that the pan bottom will be in spaced, substantially parallel relation to the supporting surface for the carriage wheels, providing a material transporting position; said forward stops then arresting further forward movement of said first pair of rollers so that further operation of said drawing means will tilt the pan upwardly about the axis of said forward pair of rollers to a material discharge position; said forward pair of rollers, upon rearward movement of said pan along said side frames from the transporting position, descending faster than the rearward pair of rollers, due to the steeper slope of said runways, to tilt the pan to the digging position, and said rear runway stops restraining rearward pan movement in the digging position, thereby relieving strain on said drawing means; and means operable, in the diggin position of said pan, to arrest upward movement of the rear end of the pan.

2. A scraper as claimed in claim 1 including means mounted on said side frames, in the path of tilting movement of said pan about the axis of said first pair of rollers, to engage said drawing means to limit such tilting movement.

3. A scraper as claimed in claim 1 in which said second pair of rollers roll on the upper surfaces of said rails and said last-named means comprises a third pair of rollers disposed beneath said second pair and rolling on the undersurfaces of said rails, the latter being formed with openings alignable with said third pair of rollers in the transporting position of the pan to provide for tilting of said pan to the discharge position.

4. A scraper as claimed in claim 1 including a door pivotally supported on the forward end of said pan and movable by gravity to a closing position in the transport position of the pan; cooperating stop means on said door and frame operable, during tilting of said pan to the discharge position, to swing said door open; and other stop means on said frame, cooperable with the door stop means during rearward and downward movement of said pan to the digging position, to swing said door open.

5. A scraper as claimed in claim 1 including a pair of laterally spaced, interconnected links pivoted on the axis of said first pair of rollers and projecting forwardly from said pan; a door pivotally suspended from intermediate points on said links and movable by gravity to close the pan in the transport position of the latter; means on said door engageable with said links to limit outward swinging of the door relative to said links; stop means on said frame, in advance of said forward runway stops, operable to engage the free ends of said links during tilting of said pan to the discharge position, to swing the links relative to said pan to open said door; and other stop means on said frame engageable with said links, during movement of said pan downwardly and rearwardly to the digging position, to arrest downward movement of said links to swing said door open.

6. A scraper as claimed in claim 1 in which said drawing means comprises sheave means mounted intermediate the ends of said pan above said rollers; sheave means on the forward end of said frame; a pulley dirigibly mounted on the forward end of said frame; and a flexible linear element trained over both of said sheave means and around said pulley and attachable to a winch or the like on a tractor pulling said carriage. I

BERNARD LUCIEN DnsIRE' LAMY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,394,350 Powers Oct. 18, 1921 2,088,091 Moore July 27, 1937 2,256,051 Haile Sept. 16, 1941 2,425,664 Zakel Aug. 12, 1947 FOREIGN PATENTS Number Country Date 19,808/29 Australia May 13, 1930 

